He and friends attending a party had climbed onto the nearby bluffs and Grimaldi lost his footing while trying to come down, according to police. He landed on the branches of a felled tree, and was punctured in the chest.

He was pronounced dead on arrival at a local hospital.

Grimaldi was a senior at Ward Melville High School and was set to graduate next month along with his twin brother. The school plans to have grief counselors available when classes resume this week.